Due to reasons that only Wizards of the Coast itself can be sure of, the cards in Jumpstart on Arena are not the same as they are on the tabletop
Will's supporter ability will guarantee Heads on Xatu's coin flip, eliminating the random factor
Yes, the cards you draw will always be lands and yes, no matter how well you shuffle your deck after, you draw another land way too often because variance hates you
Collectors searching for a specific card for their deck can head to their local trading card store or social media forums to set up a trade
In fact, the whole Scarlet & Violet set has seen its prices crash, and crash hard, in its first fortnight on sale
Cool that you stick with just Japanese though, for some consistency